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346A

Western Electric three-electrode cold-cathode gas-filled tube for relay, rectifier, and voltage-regulator or control service in industrial and communications equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: UX4
Base pins: -
Nominal heater: -

Description

Western Electric 346A is a three-electrode cold-cathode gas-filled tube for relay, rectifier and voltage-regulator/control service.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: UX4
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Max cathode current: 10 mA
Regulator voltage: 60 V
Regulator starting voltage: 70 V
Regulator maintaining voltage: 60 V

Cold-cathode main/starter-gap device; regulator fields reflect the published starter/control-gap breakdown and sustaining values.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

2026 Western Electric 300s

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum forward peak cathode current
30 mA
Maximum average cathode current
10 mA
Maximum inverse peak anode current
5 mA

Characteristic

Main-gap breakdown voltage
150 V
Main-gap sustaining voltage
75 V
Control/starter-gap breakdown voltage
70 V
Control/starter-gap sustaining voltage
60 V